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The Effect of Lumbosacral Orthosis on the Thickness of Deep Trunk Muscles Using Ultrasound Imaging

A Randomized Controlled Trial in Patients With Chronic Low Back Pain

Azadinia, Fatemeh PhD; Ebrahimi Takamjani, Ismail PhD; Kamyab, Mojtaba PhD; Kalbassi, Gitta PhD; Sarrafzadeh, Javad PhD; Parnianpour, Mohamad PhD

American Journal of Physical Medicine & Rehabilitation: July 2019 - Volume 98 - Issue 7 - p 536–544
doi: 10.1097/PHM.0000000000001135
Original Research Articles
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Objective This study was conducted to evaluate the changes occurring in the thickness of deep trunk muscles, measured using ultrasound imaging, after 4 wks of lumbosacral orthosis use in conjunction with routine physical therapy.

Design This parallel-group, randomized, controlled trial was conducted on 44 patients with nonspecific chronic low back pain, randomly allocated to the experimental and control groups. Both groups received eight sessions of physical therapy twice per week for 4 wks. The experimental group wore nonextensible lumbosacral orthosis, in addition to undergoing routine physical therapy. The thickness of the transversus abdominis, obliquus internus, and lumbar multifidus was measured by ultrasound before and after the 4-wk intervention.

Results The deep trunk muscles differed in thickness in various test positions. Four weeks of intervention with lumbosacral orthosis and routine physical therapy, however, did not change the thickness of the obliquus internus, transversus abdominis, and lumbar multifidus.

Conclusions Wearing lumbosacral orthosis for an average of 7.21 hrs/d for 4 wks in conjunction with routine physical therapy did not affect the thickness of obliquus internus, transversus abdominis, and lumbar multifidus.

From the Department of Orthotics and Prosthetics, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran (FA, MK); Department of Physical Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran (IET, JS); School of Rehabilitation Sciences, Tehran Universities of Medical Sciences, Tehran, Iran (GK); and Biomechanics Laboratory, Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran (MP).

All correspondence should be addressed to: Ismail Ebrahimi Takamjani, PhD, Department of Physical Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Madadkaran Ave, Shahnazari St, Mohseni Square, Mirdamad Blvd, Tehran, Iran 15459-13487.

Aspen Medical Products, Inc, Irvine, CA, donated the lumbosacral orthoses that were used in this study. The funder had no role in the interpretation or reporting of the results.

Financial disclosure statements have been obtained, and no conflicts of interest have been reported by the authors or by any individuals in control of the content of this article.

Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal’s Web site (www.ajpmr.com).

Online date: January 16, 2019

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